UPDATE 2 -
Maintenance is done. Site sandboxie.com is back up and functional.
Licensing system is functional. If you experience any licensing issues, please email support@sandboxie.com

UPDATE:
Sandboxie.com is undergoing emergency maintenance to correct the below listed issues.
We will update the thread once completed.

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All,

There were intermittent server issues affecting sandboxie.com (not the forums) on 2/28/2018 between 11:40AM - 11:52 AM EST, and also on 3/1/2018 around 1:59EST . We are still investigating and working to ensure the problem has been corrected.

If you purchased a Sandboxie license during that time, or after, and received "ERROR -191" instead of a product key, please email support@sandboxie.com to receive the correct key.